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CDL Practice Test

1160+ real cdl questions covering all 50 states + DC, free forever. Take a full test, a 10-question diagnostic, or an adaptive mock right here — no signup, progress saved on this device.

1160+
Questions
80%
Typical passing score
50
States + DC

Choose your exam track

🚗Car / Permit

Standard driver's license knowledge test

Start Car / Permit →
🚛CDL

Commercial driver's license — FMCSA sourced

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🏍️Motorcycle

Motorcycle permit — MSF sourced

Start Motorcycle →
Short on time?Start with the 20-question CDL Cheat Sheet — high-impact rules in about 10 minutes. Open the Cheat Sheet

Every CDL knowledge test

Each one is a separate exam with its own length and pass mark. Take only the ones your class and endorsements require — the process guide walks through which those are.

General KnowledgeCore · 50 questions · 80% to passAir BrakesRestriction removal · 25 questions · 80% to passCombination VehiclesCore · 20 questions · 80% to passHazardous MaterialsH endorsement · 30 questions · 80% to passTank VehiclesN endorsement · 20 questions · 80% to passDoubles and TriplesT endorsement · 20 questions · 80% to passPassenger TransportP endorsement · 20 questions · 80% to passSchool BusS endorsement · 20 questions · 80% to passLCV DoublesSpecial training · 30 questions · 80% to passLCV TriplesSpecial training · 30 questions · 80% to pass

Start from your licence class

Class AEvery test this class needsClass BEvery test this class needs

CDL guides

How to get a CDLEvery step in order, including the 14-day rule Endorsements explainedAll six codes and what each covers Restriction codesWhat limits your licence and how to remove them Pre-trip inspectionThe spoken test most candidates fail HazMat renewalThe five-year retest and TSA check LCV certificationLonger combination vehicles, and where they are legal

Follow the guided cdl Study Path

Study the test in a clear order with 10 focused modules and topic-specific questions. Verified video lessons appear automatically as they are added.

Start the CDL Study Path

Or jump straight to your state's page

Alabama CDL practice testAlaska CDL practice testArizona CDL practice testArkansas CDL practice testCalifornia CDL practice testColorado CDL practice testConnecticut CDL practice testDelaware CDL practice testDistrict of Columbia CDL practice testFlorida CDL practice testGeorgia CDL practice testHawaii CDL practice testIdaho CDL practice testIllinois CDL practice testIndiana CDL practice testIowa CDL practice testKansas CDL practice testKentucky CDL practice testLouisiana CDL practice testMaine CDL practice testMaryland CDL practice testMassachusetts CDL practice testMichigan CDL practice testMinnesota CDL practice testMississippi CDL practice testMissouri CDL practice testMontana CDL practice testNebraska CDL practice testNevada CDL practice testNew Hampshire CDL practice testNew Jersey CDL practice testNew Mexico CDL practice testNew York CDL practice testNorth Carolina CDL practice testNorth Dakota CDL practice testOhio CDL practice testOklahoma CDL practice testOregon CDL practice testPennsylvania CDL practice testRhode Island CDL practice testSouth Carolina CDL practice testSouth Dakota CDL practice testTennessee CDL practice testTexas CDL practice testUtah CDL practice testVermont CDL practice testVirginia CDL practice testWashington CDL practice testWest Virginia CDL practice testWisconsin CDL practice testWyoming CDL practice test

Sample CDL general knowledge test questions

  1. What is the maximum BAC allowed for CDL holders operating a commercial vehicle?

    • A. 0.04%
    • B. 0.08%
    • C. 0.02%
    • D. 0.00%
    Show answer

    A. 0.04% — CDL holders face a stricter 0.04% BAC limit because commercial vehicles are heavier and harder to stop, making impairment far more dangerous. Even at 0.04% a driver can be charged with DUI regardless of how they feel.

    Universal rule · checked against 49 CFR § 392.5 — Alcohol prohibition and 0.04 BAC standard for drivers on duty · verified 2026-05-17

  2. What are the three emergency equipment items required on commercial vehicles?

    • A. Fire extinguisher, spare fuses, warning triangles
    • B. First aid kit, flares, flashlight
    • C. Jack, tire iron, jumper cables
    • D. Tow strap, shovel, ice scraper
    Show answer

    A. Fire extinguisher, spare fuses, warning triangles — Federal law requires all commercial motor vehicles to carry a fire extinguisher of the correct type and rating, a set of three reflective warning triangles, and spare electrical fuses — missing any item is an out-of-service violation.

    Universal rule · checked against 49 CFR § 393.95 — Emergency equipment on commercial motor vehicles · verified 2026-05-17

  3. How often should you check your mirrors while driving a commercial vehicle?

    • A. Every 30 seconds
    • B. Every minute
    • C. Every 5-8 seconds
    • D. Only when changing lanes
    Show answer

    C. Every 5-8 seconds — Check mirrors every 5-8 seconds to maintain awareness of your surroundings and traffic conditions.

    Universal rule · checked against FMCSA Commercial Driver License Manual — Section 2: Driving Safely · verified 2026-05-17

  4. At what PSI does the low air pressure warning usually activate?

    • A. 40 PSI
    • B. 60 PSI
    • C. 50 PSI
    • D. 70 PSI
    Show answer

    B. 60 PSI — The low air pressure warning signal must come on before air pressure drops below 60 PSI.

    Universal rule · checked against FMCSA Commercial Driver License Manual — Section 5: Air Brakes · verified 2026-05-17

  5. Which of these is most important for safe driving?

    • A. Proper cargo securement
    • B. Having a radio
    • C. Wearing sunglasses
    • D. Having snacks
    Show answer

    A. Proper cargo securement — Proper cargo securement helps keep the vehicle stable and prevents cargo from shifting, falling, or creating a roadway hazard.

    Universal rule · checked against FMCSA Commercial Driver License Manual — Section 3: Transporting Cargo Safely · verified 2026-05-17

Frequently asked questions

How many questions are on the CDL general knowledge test?

Practice settings vary by state. This site uses around 50 questions with a 80% study target; confirm the official format with your state agency.

Is this cdl practice test really free?

Yes. Every practice test on this page and everything in the DMV Prep app is free — no ads, no paywall, no account.

Where do the questions come from?

State driver handbooks and federal regulations are the reference base. Citation scope and recency are being revalidated across the bank.

Can I study in Spanish?

Yes — the DMV Prep app includes all 3,470+ questions in Spanish, and the whole app works in Spanish.

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